NPCs composing that spawngroup :

a_goblin_blightcaller (17%)

a_goblin_boneseer (17%)

a_goblin_dirttracer (16%)

a_goblin_flashdrowser (17%)

a_goblin_slavedriver (16%)

a_goblin_stonechanter (17%)

NPCs spawning around that spawngroup :
(Max range : 200)

nurga_92, range=37 (-1165,628,-189)

nurga_96, range=44 (-1205,617,-189)

nurga_99, range=78 (-1193,580,-189)

a_goblin_flame_chanter (50%)
a_goblin_spirit_chanter (50%)

nurga_100, range=69 (-1130,619,-189)

nurga_101, range=169 (-1128,499,-189)

nurga_102, range=146 (-1170,513,-189)

a_goblin_overseer (50%)
a_goblin_overseer (50%)

nurga_182, range=3 (-1190,655,-189)

a_goblin_death_caster (50%)
a_goblin_death_knight (50%)

nurga_a_goblin_slavedriver1_takp_import_v0, range=66 (-1133,620,-188)

nurga_a_goblin_backbiter5_takp_import_v0, range=146 (-1171,512,-188)